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How to disable Let’s Encrypt for the hostname

If you want to replace the certificate for your hostname with a custom certificate but you had enabled Let’s Encrypt, you will need to disable Let’s Encrypt for the hostname first. The following command let’s DirectAdmin know that it does not need to renew the Let’s Encrypt certificate. This is required as DirectAdmin will renew the certificate +/- 60 days after the last renewal, even when the Let’s Encrypt certificate is not installed.

rm -rf /usr/local/directadmin/data/users/user_name/domains/domain_name.lt.san_config
rm -rf /usr/local/directadmin/data/users/user_name/domains/domain_name.lt.cert.creation_time
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Proxmox: Shrinking disk of an LVM backed container

LVM, or Logical Volume Management, is a storage device management technology that gives users the power to pool and abstract the physical layout of component storage devices for easier and flexible administration. Utilizing the device mapper Linux kernel framework, the current iteration, LVM2, can be used to gather existing storage devices into groups and allocate logical units from the combined space as needed.
Continue reading “Proxmox: Shrinking disk of an LVM backed container”

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Find IP Addresses with awk

An Internet Protocol address – or IP address for short – is a series of unique numbers that are assigned to each router or hotspot accessing the internet. The string of numbers is used to tell all the machines apart on the same internet. Much like your house needs a mailing address to send and receive packages or letters, your device – whether it’s a computer, a phone or something else – needs an IP address to send and receive data.

AWK is a special-purpose programming language designed for text processing and typically used as a data extraction and reporting tool. It is a standard feature of most Unix-like operating systems.

IPv4 example:

awk '{match($0,/[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/); ip = substr($0,RSTART,RLENGTH); print ip}'
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Proxmox VE 5.4 software RAID using MDADM

Proxmox Virtual Environment is an open source server virtualization management solution based on QEMU/KVM and LXC. You can manage virtual machines, containers, highly available clusters, storage and networks with an integrated, easy-to-use web interface or via CLI. Proxmox VE code is licensed under the GNU Affero General Public License, version 3. The project is developed and maintained by Proxmox Server Solutions GmbH.

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Proxmox VE 5.4 fix updates / upgrades

Proxmox VE 5.4 has been released, this version is based on Debian 9. (Linux Kernel 4.15) It includes allot of new features, but sadly updates are still pointing to the enterprise repository for updates. This results in ugly error message when trying

apt-get update

such as:

root@server2:~# apt-get update
Hit:1 http://security.debian.org stretch/updates InRelease
Ign:2 http://ftp.debian.org/debian stretch InRelease     
Hit:3 http://ftp.debian.org/debian stretch-updates InRelease
Hit:4 http://ftp.debian.org/debian stretch Release 
Ign:5 https://enterprise.proxmox.com/debian/pve stretch InRelease
Ign:6 https://enterprise.proxmox.com/debian/pve stretch Release
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Err:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
  401  Unauthorized
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Reading package lists... Done
W: The repository 'https://enterprise.proxmox.com/debian/pve stretch Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch https://enterprise.proxmox.com/debian/pve/dists/stretch/pve-enterprise/binary-amd64/Packages  401  Unauthorized
E: Some index files failed to download. They have been ignored, or old ones used instead.

To fix this, its similar to V3.X and V4.X. We need to add one repository:

nano /etc/apt/sources.list

add:

deb http://download.proxmox.com/debian stretch pve-no-subscription

Then disable or remove

rm -f /etc/apt/sources.list.d/pve-enterprise.list

(for disable add a # in front of the first line starting with deb)

Now you can run those updates take note only 

apt-get update

and 

apt-get dist-upgrade

are supported by Proxmox!

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How to set up software RAID1 on a running LVM system (incl. GRUB2 configuration) (Ubuntu 19.04)

This guide explains how to set up software RAID1 on an already running LVM system (Ubuntu 19.04). The GRUB2 bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one).

I do not issue any guarantee that this will work for you!

Continue reading “How to set up software RAID1 on a running LVM system (incl. GRUB2 configuration) (Ubuntu 19.04)”

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Installing VMware on 19.04: Failed to build vmmon

I found a solution on mkucebek’s github sources

#!/bin/bash
VMWARE_VERSION=workstation-15.0.4
TMP_FOLDER=/tmp/patch-vmware
rm -fdr $TMP_FOLDER
mkdir -p $TMP_FOLDER
cd $TMP_FOLDER
git clone https://github.com/mkubecek/vmware-host-modules.git
cd $TMP_FOLDER/vmware-host-modules
git checkout $VMWARE_VERSION
git fetch
make
sudo make install
sudo rm /usr/lib/vmware/lib/libz.so.1/libz.so.1
sudo ln -s /lib/x86_64-linux-gnu/libz.so.1 
/usr/lib/vmware/lib/libz.so.1/libz.so.1
sudo /etc/init.d/vmware restart

Then, you just have to launch VMware Workstation without building modules.